Genetics
Review
01/30/15 Free template from www.brainybetty.com
2
Vocabulary Review
• trait
-A physical characteristic.
• heredity
-The pa...
01/30/15 Free template from www.brainybetty.com
3
Question
Which of the following is an example
of a trait?
A. Bb
B. Talki...
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4
Alleles
• Genes are the factors that control
Traits.
• Alleles are the d...
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5
Question
What is the term for factors that
control traits?
A. Genes
B. P...
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6
Question
Which term refers to physical
characteristics that are studied ...
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7
DOMINANT and recessive
Alleles
• A dominant allele is one whose
trait al...
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8
Practice
• R is the dominant allele for a one
eyed monster.
• r is the r...
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9
Monster Genetics
• Rr
• How many eyes will our monster
have?????
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10
Monster Genetics
• RR
• How many eyes will our monster
have??
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11
Monster Genetics
• rr
• How many eyes will our monster
have??
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12
Question
What does the notation TT mean to
geneticists?
A. Two dominant...
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13
Codominance
• Some alleles are neither dominant
or recessive.
• Codomin...
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14
What will Happen?
• You have two flowers, a white and
a red, that are c...
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15
Phenotype
• Phenotype is an organisms
physical appearance or its visibl...
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16
Genotype
• Genotype is an organisms
genetic makeup, or allele
combinati...
01/30/15 Free template from www.brainybetty.com
17
Describing genotypes
• Homozygous (or Purebred) is
used to describe an ...
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18
Question
Pick the answer that best describes
“Aa”.
A. Homozygous
B. het...
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19
Punnett Squares
• A punnett square is a chart that
shows all possible c...
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20
Punnett Example
• Yellow is dominant over Green.
• What is the probabil...
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21
Punnett Problems
• In purple people eaters, one-horn
is dominant and no...
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22
Answer
• Hybrids have two different alleles
for one trait.
• Hh is the ...
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23
Punnett Problems
• In Bears the dominant allele for
brown fur is R, bla...
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24
Question
• What are the four possible
phenotypes for the cubs?
A. RR, R...
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25
Question
• What is the probability that the cub
will have black fur?
A....
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26
Question
What do you call one set of
instructions for an inherited trai...
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27
Question
Two forms of a gene, one from each
parent, are called
a. allel...
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28
Question
What is a plant that has two
dominant genes or two recessive
g...
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29
Question
The allele for freckles, F, is dominant
among humans. If a wom...
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30
Question
Part of a mouse’s tail is cut off as the mouse
escapes from a ...
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31
Question
What is the genotype of the offspring
represented in the upper...
01/30/15 Free template from www.brainybetty.com
32
Question
What is the genotype of the offspring
represented in the upper...
01/30/15 Free template from www.brainybetty.com
33
Question
What is the ratio of Rr (purple-flowered
plants) to rr (white-...
01/30/15 Free template from www.brainybetty.com
34
Question
Green seed color (G) is dominant to
yellow seed color (g). If ...
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Genetics review and problems 2a

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Genetics review and problems 2a

  1. 1. Genetics Review
  2. 2. 01/30/15 Free template from www.brainybetty.com 2 Vocabulary Review • trait -A physical characteristic. • heredity -The passing of traits from parents to offspring. • genetics - The scientific study of heredity.
  3. 3. 01/30/15 Free template from www.brainybetty.com 3 Question Which of the following is an example of a trait? A. Bb B. Talking loud C. Brown eyes D. Bleach blonde hair
  4. 4. 01/30/15 Free template from www.brainybetty.com 4 Alleles • Genes are the factors that control Traits. • Alleles are the different forms of Genes. • Individual Alleles control the inheritance of Traits. • An offspring receives one allele from each parent.
  5. 5. 01/30/15 Free template from www.brainybetty.com 5 Question What is the term for factors that control traits? A. Genes B. Purebreds C. Recessives D. Parents
  6. 6. 01/30/15 Free template from www.brainybetty.com 6 Question Which term refers to physical characteristics that are studied in genetics? A. Traits B. Offspring C. Generations D. Hybrids
  7. 7. 01/30/15 Free template from www.brainybetty.com 7 DOMINANT and recessive Alleles • A dominant allele is one whose trait always shows up in an organism when the allele is present. - capital letter (AA, Aa) • A recessive allele is covered up when the dominant allele is present. - lower case letter (aa)
  8. 8. 01/30/15 Free template from www.brainybetty.com 8 Practice • R is the dominant allele for a one eyed monster. • r is the recessive allele for a monster with two eyes.
  9. 9. 01/30/15 Free template from www.brainybetty.com 9 Monster Genetics • Rr • How many eyes will our monster have?????
  10. 10. 01/30/15 Free template from www.brainybetty.com 10 Monster Genetics • RR • How many eyes will our monster have??
  11. 11. 01/30/15 Free template from www.brainybetty.com 11 Monster Genetics • rr • How many eyes will our monster have??
  12. 12. 01/30/15 Free template from www.brainybetty.com 12 Question What does the notation TT mean to geneticists? A. Two dominant alleles B. Two recessive alleles C. No dominant alleles D. One dominant and on recessive allele
  13. 13. 01/30/15 Free template from www.brainybetty.com 13 Codominance • Some alleles are neither dominant or recessive. • Codominance is when alleles are neither dominant or recessive, both alleles are expressed in the offspring.
  14. 14. 01/30/15 Free template from www.brainybetty.com 14 What will Happen? • You have two flowers, a white and a red, that are crossed. • The flowers are codominant. • What color will their offspring be.
  15. 15. 01/30/15 Free template from www.brainybetty.com 15 Phenotype • Phenotype is an organisms physical appearance or its visible traits. • Example: a pea plant stem height can be short or tall.
  16. 16. 01/30/15 Free template from www.brainybetty.com 16 Genotype • Genotype is an organisms genetic makeup, or allele combination. • Example: TT, Tt, tt
  17. 17. 01/30/15 Free template from www.brainybetty.com 17 Describing genotypes • Homozygous (or Purebred) is used to describe an organism that has two identical alleles for a trait. • Example: TT and tt • Heterozygous (or Hybrid) is used to describe an organism with two different alleles. -Example: Tt
  18. 18. 01/30/15 Free template from www.brainybetty.com 18 Question Pick the answer that best describes “Aa”. A. Homozygous B. heterozygous
  19. 19. 01/30/15 Free template from www.brainybetty.com 19 Punnett Squares • A punnett square is a chart that shows all possible combinations of alleles that can result from a genetic cross.
  20. 20. 01/30/15 Free template from www.brainybetty.com 20 Punnett Example • Yellow is dominant over Green. • What is the probability that the offspring will be yellow? 100%
  21. 21. 01/30/15 Free template from www.brainybetty.com 21 Punnett Problems • In purple people eaters, one-horn is dominant and no horns is recessive. • Draw a Punnet Square showing the cross of a purple people eater that is hybrid for horns, with a purple people eater that does not have horns.
  22. 22. 01/30/15 Free template from www.brainybetty.com 22 Answer • Hybrids have two different alleles for one trait. • Hh is the hybrid in the example. • No horns would have to be hh because it is a recessive allele.
  23. 23. 01/30/15 Free template from www.brainybetty.com 23 Punnett Problems • In Bears the dominant allele for brown fur is R, black fur is recessive. • The female bear is Rr and the male bear is rr.
  24. 24. 01/30/15 Free template from www.brainybetty.com 24 Question • What are the four possible phenotypes for the cubs? A. RR, Rr B. Rr, rr C. 2 brown, 2 black D. 3 brown, 1 black
  25. 25. 01/30/15 Free template from www.brainybetty.com 25 Question • What is the probability that the cub will have black fur? A. 50% B. 25% C. 75% D. 100%
  26. 26. 01/30/15 Free template from www.brainybetty.com 26 Question What do you call one set of instructions for an inherited trait? a. alleles b. phenotype c. albinism d. genes
  27. 27. 01/30/15 Free template from www.brainybetty.com 27 Question Two forms of a gene, one from each parent, are called a. alleles. b. phenotypes. c. albinism. d. genes.
  28. 28. 01/30/15 Free template from www.brainybetty.com 28 Question What is a plant that has two dominant genes or two recessive genes called? a. organism b. genotype c. homozygous d. heterozygous
  29. 29. 01/30/15 Free template from www.brainybetty.com 29 Question The allele for freckles, F, is dominant among humans. If a woman with freckles (FF) and a man without freckles (ff) have children, what are the possible genotypes of the children? A. Ff B. FF, Ff, ff C. Ff, ff D. ff
  30. 30. 01/30/15 Free template from www.brainybetty.com 30 Question Part of a mouse’s tail is cut off as the mouse escapes from a cat. The mouse later reproduces. Which explanation best describes why the mouse’s offspring have long tails? A. Long tails are a dominant trait. B. Short tails do not appear in the first generation or the second generation. C. Cutting the tail of the mouse changed its genes. D. Cutting the tail of the mouse did not change its genes.
  31. 31. 01/30/15 Free template from www.brainybetty.com 31 Question What is the genotype of the offspring represented in the upper left-hand box of the Punnett square? A RR B Rr C rr D rrr
  32. 32. 01/30/15 Free template from www.brainybetty.com 32 Question What is the genotype of the offspring represented in the upper left-hand box of the Punnett square? A RR B Rr C rr D rrr
  33. 33. 01/30/15 Free template from www.brainybetty.com 33 Question What is the ratio of Rr (purple-flowered plants) to rr (white-flowered plants) in the offspring? A 1:3 B 2:2 C 3:1 D 4:0
  34. 34. 01/30/15 Free template from www.brainybetty.com 34 Question Green seed color (G) is dominant to yellow seed color (g). If two heterozygous parents are crossed, what will be the resulting genotypes of the offspring? A. GG, Gg, gg B. Gg, gg C. GG, Gg D. gg, GG

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